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sh: Consolidate segment modifiers across mmu/nommu systems. 

This moves get_fs/set_fs() and friends in to asm/segment.h. The
mm_segment_t definition is likewise consolidated from the _32/_64 split.

This is prepatory groundwork for using the generic address space limit
and verification routines across mmu/nommu configs.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2008-06-03 18:48:54 +09:00
parent 3787aa112c
commit 02f7e627f9
5 changed files with 33 additions and 39 deletions
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1
include/asm-sh/processor.h
View File

@ -2,6 +2,7 @@
#define __ASM_SH_PROCESSOR_H
#include <asm/cpu-features.h>
#include <asm/segment.h>
#ifndef __ASSEMBLY__
/*

4
include/asm-sh/processor_32.h
View File

@ -113,10 +113,6 @@ struct thread_struct {
union sh_fpu_union fpu;
};
typedef struct {
unsigned long seg;
} mm_segment_t;
/* Count of active tasks with UBC settings */
extern int ubc_usercnt;

4
include/asm-sh/processor_64.h
View File

@ -166,10 +166,6 @@ struct thread_struct {
union sh_fpu_union fpu;
};
typedef struct {
unsigned long seg;
} mm_segment_t;
#define INIT_MMAP \
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }

30
include/asm-sh/segment.h
View File

@ -1,6 +1,34 @@
#ifndef __ASM_SH_SEGMENT_H
#define __ASM_SH_SEGMENT_H
/* Only here because we have some old header files that expect it.. */
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
#ifdef CONFIG_MMU
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#else
#define USER_DS KERNEL_DS
#endif
#define segment_eq(a,b) ((a).seg == (b).seg)
#define get_ds() (KERNEL_DS)
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
#endif /* __ASSEMBLY__ */
#endif /* __ASM_SH_SEGMENT_H */

33
include/asm-sh/uaccess_32.h
View File

@ -1,9 +1,8 @@
/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
*
/*
* User space memory access functions
*
* Copyright (C) 1999, 2002 Niibe Yutaka
* Copyright (C) 2003 Paul Mundt
* Copyright (C) 2003 - 2008 Paul Mundt
*
* Based on:
* MIPS implementation version 1.15 by
@ -15,40 +14,16 @@
#include <linux/errno.h>
#include <linux/sched.h>
#include <asm/segment.h>
#define VERIFY_READ 0
#define VERIFY_WRITE 1
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons (Data Segment Register?), these macros are misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
#define segment_eq(a,b) ((a).seg == (b).seg)
#define get_ds() (KERNEL_DS)
#if !defined(CONFIG_MMU)
/* NOMMU is always true */
#define __addr_ok(addr) (1)
static inline mm_segment_t get_fs(void)
{
return USER_DS;
}
static inline void set_fs(mm_segment_t s)
{
}
/*
* __access_ok: Check if address with size is OK or not.
*
@ -64,8 +39,6 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
#define __addr_ok(addr) \
((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
#define get_fs() (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))
/*
* __access_ok: Check if address with size is OK or not.